What causes a plugged up valve on a PCV system?
What causes a plugged up valve on a PCV system? The most common problem that afflicts the PCV systems is a plugged up PCV valve or hose. Accumulation of fuel and oil varnish deposits and/or sludge inside the valve can restrict or even block the flow of vapors through the valve. Why is the PCV valve so important in a car? Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology. You probably don't realize how important the PCV system—the Positive Crankcase Ventilation (PCV) valve and its related components—is to the well-being of...